Abstract
Composite films made by simultaneous sublimation of metal and organic materials were used as sensors for moisture in overlying polymeric films, and polymer transport properties were obtained from a spatially resolved signal. In the probe film, the molecularly dispersed metal quenched the fluorescence of the organic dye. Upon exposure to water vapor, the metal was oxidized and the fluorescence of the dye recovered. The intensity profile development over time was modeled, and a diffusion coefficient for a ultraviolet-curable adhesive was obtained which compared well to other resins of its type. This technique offers several advantages in characterizing transport properties in confined geometries, such as those used for the passivation of light-emitting diodes or other electronic devices.
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